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TiO2 doping effect on reflective coating mechanical loss for gravitational wave detection at low temperature

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arxiv 2312.11940 v1 pith:UZ3KRPF6 submitted 2023-12-19 gr-qc astro-ph.IMphysics.ins-det

Yukino Mori , Yota Nakayama , Kazuhiro Yamamoto , Takafumi Ushiba , Dani`ele Forest , Christophe Michel , Laurent Pinard , Julien Teillo
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Gianpietro Cagnoli
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classification gr-qcastro-ph.IMphysics.ins-det
keywords coatingtio2losstemperaturedependencedisksmaximummeasured
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We measured the mechanical loss of a dielectric multilayer reflective coating (ion-beam-sputtered SiO2 and Ta2O5) with and without TiO2 on sapphire disks between 6 and 77 K. The measured loss angle exhibited a temperature dependence, and the local maximum was found at approximately 20 K. This maximum was 7.0*10^(-4) (with TiO2) and 7.7*10^(-4) (without TiO2), although the previous measurement for the coating on sapphire disks showed almost no temperature dependence (Phys. Rev. D 74 022002 (2006)). We evaluated the coating thermal noise in KAGRA and discussed future investigation strategies.

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